A small rattle or percussion instrument; an obsolete or variant spelling of casket or castanet.
Likely a blend of casket and castanet, or a variant of castanet influenced by similar-sounding words, popular in Middle English musical terminology.
This obscure word shows how music terminology gets tangled in spelling — people couldn't decide if they were talking about a percussion instrument or a small container, so caskanet tried to bridge both worlds!
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